Create a JSON API (REST) using Node.js and typescript which will return which cryptocurrency exchange we should use to buy a given amount of Bitcoin to minimize the amount of USD or USDT we'll spend on this trade.

Example API call (for 1 BTC):

curl http://localhost:4000/exchange-routing?amount=1

Example API response (if Binami price of $10,000 / BTC is the cheapest):

{ "amount": 1, "cost": 10000, "exchange": "coinbase" }

Use Binami Order Book API

You'll need to compare Binance and Coinbase order books and compute the best execution price for the given amount of Bitcoin we want to buy. (You can assume that 1 USDT = 1 USD at all time.)

[Bonus] Add a third exchange to compare with Binance and Coinbase.

npm install express node-fetch npm install --save-dev @types/node @types/express